British scientists found that a two-dose COVID-19 vaccine regimen did not produce enough neutralizing antibodies against the Omicron coronavirus variant, suggesting a possible increase in infections in already infected people. or previously vaccinated.
Researchers from the University of Oxford released results on Monday from a yet-to-be peer-reviewed study in which they analyzed blood samples from participants who received doses from AstraZeneca-Oxford or Pfizer -BioNTech in a large study looking at vaccine mixing.
The results come a day after British Prime Minister Boris Johnson warned that two injections would not be enough to contain Omicron, following the discovery by British health authorities last week that boosters significantly restored protection. protection against variation.
The Oxford study says there is no evidence yet that lower levels of infection-fighting antibodies against Omicron can lead to a higher risk of serious illness, hospitalization or death in people who have received two doses of the vaccine. – Please approved.
“These data are important but only part of the picture. They only look at neutralizing antibodies after the second dose, but don’t tell us about immunity,” said Matthew Snape, professor at Oxford and colleagues. cell fluid, and this will also be tested.” – the author of the article.
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